Ferrer-Gallego, Pedro Pablo, Roberto Roselló, Emilio Laguna, José Gómez, and Juan B. Peris. 2014. “Typification of Two Linnaean Names: Centaurea Aspera and Centaurea Isnardii (Asteraceae)”. Phytotaxa 183 (2). Auckland, New Zealand:114–118. https://doi.org/10.11646/phytotaxa.183.2.4.